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Hollis Dg05 CCR upgrade code

Hi I have the Dg05 OC trimix computer but I recently bought a rebreather so I want to upgrade it to CCR. I cannot find a place to purchase the codes though, no one seems to sell them except a shop in Hungary and their price is absurd, in fact for that price i might as well chip in a little more and buy a brand new Petrel 2. Anyone know where else I could look?